Pump for compressed liquefied gases



Jan. 21, 1936. TEA S 2,028,531

PUMP FOR COMPRESSED LIQUEFIED GASES Filed. July 31, 1933 XNVENTOR BY 2 m AT ORNEY Patented Jan. 21,1936

UNITED. STATES PATENT OFFICE PUMP FQR COMPRESSED LIQUEFIED GASES Application July 31, 1933, Serial No. 682,948

1 Claim.

- In pumping compressed liquefied gases, a peculiar difliculty is created by reason of the highly volatile character of the material. The thin film of liquid which adheres to the rod of the pump 5 piston evaporates as-it reaches the air on the disclosed in the specification and broadly covered in the claim.

- The drawing accompanying and forming part of the specification illustrates one of the pres-- ent commercial embodiments of the invention, it being understood that the structure may be modified as regards this particular'illustration all withinthe true spirit and broad scope of the invention.

Fig. 1' of the drawing is a broken side elevation of a steam pump construction having the invention incorporated therein.

Fig. 2 is an enlarged vertical sectional detail 30 as on line 2-2 of Fig. 1.

The pump shown comprises a steam cylinder 3, and a liquid cylinder 4, the. same having pistons operating therein connected'by a piston rod 5,

sliding through glands 6, I at the confronting 35 ends of the cylinders. I

"The steam cylinder may have the usualsteam supply and exhaust connections, suitable supply piping being indicated at 8. The piping for the liquid or pump cylinder is not shown, the same 40 varying with requirements. a l At 9, a branch connection is indicated.' extending from the steam supply pipe and terminating in nozzles II), II, positioned to direct small jets of steam onto oppositegsides of the piston 45 rod adjacent the point. of emergence from the packing gland I.

A valve I2 is shown in the branch line for governing the 'amount of steam used and individually' regulatablevalves may be provided in the nozzle pipes l3, ll, for separately adjusting the two steam jets. These nozzle pipes are shown as extending downwardly from the branches l5, ii, "of a special U-shaped elbow l'l, having a side inlet l8, in the arch of the U screwed onto the end of the supply piping 9. r

The nozzles for the steam jets consist simply of inturned ends of the vertical jet pipes l3, I, but if desired, a special nozzle or nozzles, such as for spraying steam or other frost dissipating fluid all around the pipe, may be provided. 5 v

' In practice, it has been found best to locate the steam jets, so as to discharge on the packing gland as well as on the piston rod, the jet nozzles being .shown located closely adjacent the packing gland for this reason.

With this invention, the film of highly volatile liquid clinging to the emerging piston rod is instantly dissipated and enough heat applied to the surface where evaporation occurs to prevent ice formation.

The structure illustrated is practical and can be inexpensively applied to} existing pumps for handling liquefied'gases, such as propane, butane and the like, but the invention is not restricted to this particul hform of structure and modifications in form may be made to suit particular requirements or conditions. Also other medium than steam may be-used. Thus, heated com- .pressed air or other gaseous material may be used to prevent the freezing efiect on the projecting piston rod. The'de-frosting' or frost preventive spray may be intermittent; instead of continuous, being timed for example, by an automatic, valve driven by or synchronized with the pump to prevent or dissipate the frost film as the piston rod is on its out stroke orhas completed .the out stroke and is about to reenter the stuffing box.

What is claimed is: Ina pump for compressed liquefied gases, the

combination of steam and pump cylinders with :40

pistons operating therein connected by a piston rod operating through glands at the confronting ends of the cylinders, steam connections with the steam cylinder and piston rod-steaming means supplied from said steam connections and located adjacent the gland of the. pump cylinder and including a steam nozzle directed toward the piston rod connected by piping with the steam connections aforesaid, said piping having a controlling valve therein.

CLAUDE F. I 

